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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1030/x = 257.5 // - 257.5
1030/x-257.5 = 0
1030*x^-1 = 257.5 // : 1030
x^-1 = 0.25
-1 < 0
1/(x^1) = 0.25 // * x^1
1 = 0.25*x^1 // : 0.25
4 = x^1
x = 4
x = 4
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